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HF-TC-614 Transformer Short Circuit Impedance Tester
Transformer Short Circuit Impedance Tester automatically tests short-circuit impedance, impedance voltage and winding reactance of power transformers. It outputs stable test data with high measuring precision, supporting factory delivery inspection and regular on-site maintenance tests for power stations and manufacturing plants.
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Low-voltage short-circuit impedance measurement is a fundamental routine test item. By comparing impedance values measured before and after the transformer sustains short-circuit current shocks, users can preliminarily evaluate the degree of winding deformation. The deviation of low-voltage short-circuit impedance after short-circuit impact shall not exceed 2% relative to the original factory test value.
The low-voltage short-circuit impedance test serves as a direct method to detect winding deformation caused by short-circuit surges during operation or mechanical collisions during transportation and installation. It is critical for evaluating whether a transformer can be put into service and provides a key basis for deciding whether disassembly inspection is required.
Model HF-TC-614 Transformer Short Circuit Impedance Tester is equipped with an internal adjustable power supply. It is specially developed for field low-voltage short-circuit impedance measurement on 110 kV and above main power transformers.
Alternative Product Names
Transformer Comprehensive Parameter Tester, Transformer Characteristic Tester, Transformer Winding Deformation Tester, Transformer Short Circuit Impedance Tester
Performance Features
- Built-in adjustable power supply. It completes measurements of all winding pairs with only one-time wiring for single-phase and three-phase transformers, simplifying field wiring and test operations.
- Adopts single-phase measurement mode. For three-phase transformers, it automatically calculates short-circuit impedance, reactance and inductance of each phase through three voltage boosting cycles.
- Uses phase-locked loop technology for synchronous sampling of AC signals to guarantee high accuracy of measured data.
- Capable of measuring voltage, current, power, frequency and other electrical parameters.
- Wide built-in voltage and current measurement ranges; external CT and PT access is supported to further expand test ranges.
- Non-volatile internal memory stores test data long-term; integrated thermal printer is configured for on-site report output.
- Test data can be exported to computers for deep analysis and permanent file archiving.
- Full Chinese menu with operational prompts for intuitive and easy operation.
- Transflective large-screen LCD maintains clear display under direct sunlight.
Technical Specifications
| Item | Specification |
|---|---|
| Measurement Accuracy – Voltage / Current | Class 0.2 |
| Power Accuracy | Class 0.5 (cosφ＞0.1); Class 1.0 (cosφ≤0.1) |
| Impedance Accuracy | Class 0.5 (cosφ＞0.1); Class 1.0 (cosφ≤0.1) |
| Voltage Measurement Range | AC 3 V ~ 300 V |
| Internal Power Output | Voltage 0 ~ 250 V; Current 0 ~ 10 A |
| Current Measurement Range | AC 0.2 A ~ 20 A |
| Operating Temperature | -10 ℃ ~ 50 ℃ |
| Operating Humidity | 0 ~ 80% (non-condensing) |
| Power Supply | AC 220 V ±10%, 50 Hz ±1 Hz |
| Overall Dimension | 360 × 220 × 150 mm |
| Net Weight | 5 kg |
Packing List – Transformer Short Circuit Impedance Tester
| No. | Item Name | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main tester unit | 1 | Set | Built-in power supply & printer |
| 2 | High voltage test cables | 3 | Piece | Red / yellow / black |
| 3 | Current test wires | 3 | Piece | Matched wiring terminals |
| 4 | Alligator clips | 6 | Piece | For transformer winding connection |
| 5 | Power cord (AC220V) | 1 | Piece | Mains input cable |
| 6 | USB data transmission cable | 1 | Piece | For data upload to PC |
| 7 | Thermal printer paper rolls | 2 | Roll | Spare printing consumables |
| 8 | Operation manual (English + Chinese) | 1 | Copy | With technical parameters |
| 9 | Calibration certificate | 1 | Copy | Factory calibration report |
| 10 | Hard carrying case | 1 | Piece | Shockproof portable packaging |
| 11 | Fuse spare parts | 2 | Piece | Internal backup fuses |
Target Users of Transformer Short Circuit Impedance Tester
Power grid & power supply enterprises
Provincial/municipal power bureaus, power maintenance companies, substation operation departments, used for routine overhaul, fault diagnosis and acceptance detection of running transformers.
Transformer manufacturers
Factory quality inspection workshops implement factory delivery tests, type tests and batch performance inspection for finished transformers.
EPC engineering & construction companies
Detect winding deformation during transformer hoisting, transportation, installation and commissioning on construction sites.
Metallurgy, chemical, railway & large industrial plants
Inspect self-owned high-voltage distribution transformers to guarantee safe and stable production power supply.
Third-party testing & calibration institutions
Carry out official impartial testing, appraisal and technical verification services for power equipment.
Research institutes & university laboratories
Used for transformer characteristic research, teaching experiments and relevant electrical scientific research projects.
What is Transformer Short Circuit Impedance Tester used for?
This instrument conducts low-voltage short-circuit impedance tests on power transformers. By comparing impedance data before and after short-circuit impact or mechanical collision, it judges whether transformer windings are deformed.
It is widely used for factory delivery inspection, substation maintenance, post-fault detection and acceptance check after equipment transportation and installation, providing basis to confirm if transformers can be put into operation or need disassembly overhaul.
FAQ – Transformer Short Circuit Impedance Tester
Q1: What is the main function of this tester?
A: It performs low-voltage short-circuit impedance tests on transformers. By comparing impedance data before and after short-circuit shocks or mechanical impact, it judges winding deformation and verifies whether transformers can be put into operation.
Q2: What transformer types is it suitable for?
A: It fits single-phase and three-phase transformers, especially 110kV and above main transformers in substations for on-site testing.
Q3: Does the tester have a built-in power supply?
A: Yes. It comes with an adjustable internal power output from 0–250V, eliminating extra external power sources during field tests.
Q4: How many wiring operations are needed for a three-phase transformer?
A: Only one wiring connection is required. The device automatically calculates impedance, reactance and inductance of each phase after three boosting cycles.
Q5: How accurate are the measuring results?
A: Voltage and current accuracy is Class 0.2. Power and impedance reach Class 0.5 when cosφ＞0.1 and Class 1.0 when cosφ≤0.1.
Q6: Can test data be stored and printed?
A: It has non-volatile memory for long-term data storage, a built-in thermal printer, and supports data export to computers for further analysis.
Q7: Can the measuring range be expanded?
A: Yes. It supports external CT and PT to extend voltage and current measurement limits for large-capacity transformers.
Q8: Is it easy to operate outdoors under strong sunlight?
A: Equipped with a transflective large LCD screen, it delivers clear display under direct sunlight with intuitive Chinese menu prompts.
Q9: What is the allowable deviation standard of short-circuit impedance?
A: The impedance change after short-circuit impact shall not exceed 2% compared with the original factory test value.
Q10: What is the working temperature range of the instrument?
A: Operating temperature ranges from -10℃ to 50℃ with working humidity of 0~80% non-condensing.
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